Lens



FIG. 1 is a top and front perspective view of a lens showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a vertical cross-sectional view thereof, taken along line 6-6 of FIG. 3. 

CLAIM The ornamental design for a lens, as shown and described. 